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Slot Machine Bonus Games – Best Slots with Bonus Rounds

The most exciting part of any online slot game is the bonus round. Every developer includes bonus features in slots, be it free spins, special symbols, or jackpots that deliver instant prizes.

In most games, the bonus round is triggered randomly with the help of scatter symbols, though you can also buy access to bonus rounds in some slots for a specific fee.

Here, we explain everything you need to know about slots with bonus rounds and introduce you to the best bonus slot machine games to play right now at Stake Casino .

What are Bonus Games & Bonus Rounds in Slot Machines?

Bonus games are special rounds in slot games randomly triggered by special symbols falling on the reels.

Once triggered, the bonus round lasts for a pre-determined amount of time (usually for a specific number of spins), and you’re not required to place additional bets while the feature is active.

In most games, you can land huge potential wins when the bonus round is active, often over 1,000x the bet.

But as we explain below, bonus games are incredibly varied and consist of various symbols, features, and mechanics.

How do Bonus Games & Bonus Rounds Work in Online Slots?

Bonus rounds in slot games can trigger randomly at any stage of the game. They’re sought after because they represent your best opportunity to land the biggest payouts in the game.

Most bonus games offer free spins, multipliers, instant prizes, jackpots, special symbols , and other elements to crank up the excitement.

While bonus games are randomly triggered in the base game, you can also buy access to these games for a pre-determined fee in selected slot games.

Types of Bonus Games & Bonus Rounds

Let’s take a closer look at some of the different bonus rounds you can trigger in slot games:

Game Explanation
Free spins Free spins are the most popular type of bonus game. When a specific number of scatters land, you’re awarded a set number of free spins of the reels to try and land payouts.
Jackpot bonus Some slots offer in-game jackpots that provide 3-5 fixed prizes. During the bonus feature, you can land these jackpot prizes when specific symbols land on the reels.
Progressive jackpots While some jackpots are fixed, others offer progressive payouts that can deliver massive sums of money.
Gamble Slots with a gamble feature allow you to gamble the value of your payout to try and double it. Be careful, though; you can lose your winnings if you don’t win the gamble round.
Bonus wheel You can also play slots that offer a bonus wheel. You get the chance to spin the wheel, and each segment can deliver different features, including free spins, instant prizes, multipliers, or jackpot bonuses.
Pick a reward Pick-a-reward bonus games invite you to select a card or chest that reveals a specific prize, be it an instant payout, free spins, or multipliers.
Wild symbols Wild symbols are a bonus feature themselves, as they can land across the game matrix to form winning combinations.
Scatter symbols Scatter symbols typically trigger access to the game’s bonus round when at least three symbols are in view at any given time.

How to Trigger Bonus Rounds

There are two ways to trigger bonus rounds in slots. The first is via the game’s scatter symbols , which can land randomly on the grid. You usually need at least three scatter symbols in view to trigger the bonus round.

The other way is to buy access to the bonus round. Many slots have bonus buy features, giving you instant access to the bonus round for a fixed fee, which is often around 100x the bet.

Common Features in Bonus Rounds

After triggering a bonus round in a slot game, you may come across the following special features:

  • Expanding symbols: These are special symbols that can land on the grid. When they appear, they expand to cover multiple sections and perhaps even an entire reel to help you form winning combinations.

  • Walking wilds: Walking wilds can move around the grid during the bonus game to help you land wins in multiple locations on the game matrix.

  • Wild reels: This is when an entire reel consists of wild symbols for the duration of the bonus round.

  • Colossal symbols: These symbols tend to be 2x2, 3x3, or even 5x5 in size and may cover the entire game matrix.

  • Multipliers: Some bonus games attach multipliers to specific symbols, which increases the value of all payouts by a specific amount (2x, 5x, 10x, etc.).

  • Sticky symbols: In bonus games, sticky symbols remain in their place for the entirety of the bonus round and can contribute to multiple wins.

  • Stacked symbols: This is when identical symbols stack on top of one another to improve your chances of landing winning combinations.

How to Choose the Best Slots with Bonus Games

The easiest way to pick the best slots is to read the game description. You can find all the information you need about the game’s bonus features, including how to trigger them and buy access to them. You can then pay attention to the bonus features as you spin the reels.

Odds, House Edge & Return to Player (RTP)

You should always check a slot game's theoretical return to player (RTP) before spinning the reels. This indicates how much the game pays out on average, and the higher the RTP, the better it is for players.

Learn more about house edges, RTP, and your odds of winning with our casino house edge guide and utilise them to your advantage!

Best Slots with Bonus Games at

You’re truly spoiled for choice when it comes to slot games and themes at Stake Casino. Our extensive slots library has some brilliant bonus rounds and special features.

Hacksaw Gaming’s horror-themed slot Chaos Crew 2 is a feature-rich slot with epic drops and an in-game bonus round featuring multiplier symbols and wins that can reach up to 20,000x the bet.

We also love the Stake Exclusive , gem-themed slot game Jewel Bonanza from the award-winning studio Pragmatic Play . The game has an enhanced RTP of 98%, a feature-buy option, and a loaded free spins round that cranks up the value of winning combinations.

You can also check out the Stake Original game, Tome of Life, for excellent bonus features. The scatter symbol in the game triggers access to the free spins bonus round, where 180 free spins are up for grabs, and multiplier symbols can land.

If you’re looking for a slot with many bonus-buy features, look no further than Nolimit City’s Wild West slot game, Tombstone RIP . You can buy access to the various free spins bonus rounds to win up to 300,000x your stake.

Tips for Playing Slots with Bonus Games

Here are some handy tips to help you play slots with bonus games at

  • Make sure you know how to play slots and discover the ins and outs of slots before placing your bets.

  • Understand the slot game’s volatility so you know how much and how often it typically pays out.

  • Play games with various paylines and in-game mechanics to spice things up. For instance, you can check out Megaways and cluster pays slots at for exciting gameplay.

  • You don’t have to wait to trigger the bonus game. Thanks to the feature-buy option, you can buy instant access to the bonus round. Learn more about feature buy slots at here.

  • Read through our how-to guides for more information that will help you as you play the best slots from leading casino studios at

How to Deposit & Withdraw Funds to Play Slots Online

Easily deposit crypto units into your account to play slot machines with bonus games and other casino games by following these simple steps:

  1. Step 1 – Retrieve your deposit address, located in Wallet > Deposit.

  2. Step 2 – Choose the method that suits your needs. supports multiple currencies, including Bitcoin (BTC), Ethereum (ETH), Dogecoin (Doge), Litecoin (LTC), and others.

  3. Step 3 – Use your deposit address as the ‘send to’ location for your crypto wallet or exchange.

  4. Step 4 (Optional) – If you wish to make a deposit via fiat currency, you can buy crypto for Stake via Moonpay. offers live support to players via our customer support staff for help with issues regarding slot machines with bonus games and depositing and withdrawing units .

Moonpay supports multiple payment options, including Visa, Mastercard, Apple Pay, Google Pay, and others, to buy cryptocurrency to enjoy slot machines with bonus games. For a full list of supported payment options, please refer to the Moonpay documentation .

Learn how to use the Stake Vault to securely store cryptocurrency online to fund future gameplay at Stake Casino. Please always remember to bet within your means and gamble responsibly . You can find out how to stay in control with our budget calculator and  Stake Smart guidelines .

Casino Promotions & VIP Club at

To play the best slots with bonus games, take advantage of our current promotions , available for all new and existing players.

You can also learn more about the exclusive rewards available to members of the Stake VIP Club to further boost your bankroll.